A professional who tends solvent extraction equipment that extracts oil from rice bran, soybeans, and cottonseeds. Respnsibilities include:

• Observes temperature and steam pressure gauges, flowmeters and ammeters, and turns valves or handwheels to regulate temperature and flow of material in equipment within specified limits.
• Tests samples of material for conformity to plant standards, using scales, moisture meter, and hydrometer, or by titration.
• Records indicator readings and test results.
• May clean filter plates of extractor.